Twelve candidate sites were selected for the GSSP; the sediments of Crawford Lake, Canada were finally proposed, in July 2023, to mark the lower boundary of the Anthropocene, starting with the Crawfordian stage/age in 1950.[12][13]
In March 2024, after 15 years of deliberation, the Anthropocene Epoch proposal of the AWG was voted down by a wide margin by the SQS, owing largely to its shallow sedimentary record and extremely recent proposed start date.[14][15] The ICS and the IUGS later formally confirmed, by a near unanimous vote, the rejection of the AWG's Anthropocene Epoch proposal for inclusion in the Geologic Time Scale.[4][5][6] The IUGS statement on the rejection concluded: "Despite its rejection as a formal unit of the Geologic Time Scale, Anthropocene will nevertheless continue to be used not only by Earth and environmental scientists, but also by social scientists, politicians and economists, as well as by the public at large. It will remain an invaluable descriptor of human impact on the Earth system."[6]
Development of the concept
An early concept for the Anthropocene was the Noosphere by Vladimir Vernadsky, who in 1938 wrote of "scientific thought as a geological force".[16] Scientists in the Soviet Union appear to have used the term Anthropocene as early as the 1960s to refer to the Quaternary, the most recent geological period.[17]
Ecologist Eugene F. Stoermer subsequently used Anthropocene with a different sense in the 1980s[18][19] and the term was widely popularised in 2000 by atmospheric chemistPaul J. Crutzen,[3][20] who regards the influence of human behavior on Earth's atmosphere in recent centuries as so significant as to constitute a new geological epoch.[21]:21[22]
The pressures we exert on the planet have become so great that scientists are considering whether the Earth has entered an entirely new geological epoch: the Anthropocene, or the age of humans. It means that we are the first people to live in an age defined by human choice, in which the dominant risk to our survival is ourselves.
The term Anthropocene is informally used in scientific contexts.[24] The Geological Society of America entitled its 2011 annual meeting: Archean to Anthropocene: The past is the key to the future.[25] The new epoch has no agreed start-date, but one proposal, based on atmospheric evidence, is to fix the start with the Industrial Revolution c.1780, with the invention of the steam engine.[26][27] Other scientists link the new term to earlier events, such as the rise of agriculture and the Neolithic Revolution (around 12,000years BP).
Evidence of relative human impact – such as the growing human influence on land use, ecosystems, biodiversity, and species extinction – is substantial; scientists think that human impact has significantly changed (or halted) the growth of biodiversity.[28][29][30][31] Those arguing for earlier dates posit that the proposed Anthropocene may have begun as early as 14,000–15,000years BP, based on geologic evidence; this has led other scientists to suggest that "the onset of the Anthropocene should be extended back many thousand years";[32]:1 this would make the Anthropocene essentially synonymous with the current term, Holocene.
Anthropocene Working Group
In 2008, the Stratigraphy Commission of the Geological Society of London considered a proposal to make the Anthropocene a formal unit of geological epoch divisions.[2][26] A majority of the commission decided the proposal had merit and should be examined further. Independent working groups of scientists from various geological societies began to determine whether the Anthropocene will be formally accepted into the Geological Time Scale.[33]
The Trinity test in July 1945 has been proposed as the start of the Anthropocene.
In January 2015, 26 of the 38members of the International Anthropocene Working Group published a paper suggesting the Trinity test on 16 July 1945 as the starting point of the proposed new epoch.[34] However, a significant minority supported one of several alternative dates.[34] A March 2015 report suggested either 1610 or 1964 as the beginning of the Anthropocene.[35] Other scholars pointed to the diachronous character of the physical strata of the Anthropocene, arguing that onset and impact are spread out over time, not reducible to a single instant or date of start.[36]
A January 2016 report on the climatic, biological, and geochemical signatures of human activity in sediments and ice cores suggested the era since the mid-20thcentury should be recognised as a geological epoch distinct from the Holocene.[37]
The Anthropocene Working Group met in Oslo in April 2016 to consolidate evidence supporting the argument for the Anthropocene as a true geologic epoch.[38] Evidence was evaluated and the group voted to recommend Anthropocene as the new geological epoch in August 2016.[7]
In April 2019, the Anthropocene Working Group (AWG) announced that they would vote on a formal proposal to the International Commission on Stratigraphy, to continue the process started at the 2016 meeting.[10] In May 2019, 29members of the 34person AWG panel voted in favour of an official proposal to be made by 2021. The AWG also voted with 29votes in favour of a starting date in the mid 20thcentury. Ten candidate sites for a Global boundary Stratotype Section and Point have been identified, one of which will be chosen to be included in the final proposal.[8][9] Possible markers include microplastics, heavy metals, or radioactive nuclei left by tests from thermonuclear weapons.[39]
In November 2021, an alternative proposal that the Anthropocene is a geological event, not an epoch, was published[40][41] and later expanded in 2022.[42] This challenged the assumption underlying the case for the Anthropocene epoch - the idea that it is possible to accurately assign a precise date of start to highly diachronous processes of human-influenced Earth system change. The argument indicated that finding a single GSSP would be impractical, given human-induced changes in the Earth system occurred at different periods, in different places, and spread under different rates. Under this model, the Anthropocene would have many events marking human-induced impacts on the planet, including the mass extinction of large vertebrates, the development of early farming, land clearance in the Americas, global-scale industrial transformation during the Industrial Revolution, and the start of the Atomic Age. The authors are members of the AWG who had voted against the official proposal of a starting date in the mid-20th century, and sought to reconcile some of the previous models (including Ruddiman and Maslin proposals). They cited Crutzen's original concept,[43] arguing that the Anthropocene is much better and more usefully conceived of as an unfolding geological event, like other major transformations in Earth's history such as the Great Oxidation Event.
In July 2023, the AWG chose Crawford Lake in Ontario, Canada as a site representing the beginning of the proposed new epoch. The sediment in that lake shows a spike in levels of plutonium from hydrogen bomb tests, a key marker the group chose to place the start of the Anthropocene in the 1950s, along with other elevated markers including carbon particles and nitrates from the burning of fossil fuels and widespread application of chemical fertilizers respectively. Had it been approved, the official declaration of the new Anthropocene epoch would have taken place in August 2024,[44] and its first age may have been named Crawfordian after the lake.[45]
Rejection in 2024 vote by IUGS
In March 2024, the New York Times reported on the results of an internal vote held by the IUGS: After nearly 15 years of debate, the proposal to ratify the Anthropocene had been defeated by a 12-to-4 margin, with 2 abstentions.[15] These results were not out of a dismissal of human impact on the planet, but rather an inability to constrain the Anthropocene in a geological context. This is because the widely-adopted 1950 start date was found to be prone to recency bias. It also overshadowed earlier examples of human impacts, many of which happened in different parts of the world at different times. Although the proposal could be raised again, this would require the entire process of debate to start from the beginning.[14] The results of the vote were officially confirmed by the IUGS and upheld as definitive later that month.[15]
Crutzen proposed the Industrial Revolution as the start of Anthropocene.[46]Lovelock proposes that the Anthropocene began with the first application of the Newcomen atmospheric engine in 1712.[47] The Intergovernmental Panel on Climate Change takes the pre-industrial era (chosen as the year 1750) as the baseline related to changes in long-lived, well mixed greenhouse gases.[48] Although it is apparent that the Industrial Revolution ushered in an unprecedented global human impact on the planet,[49] much of Earth's landscape already had been profoundly modified by human activities.[50] The human impact on Earth has grown progressively, with few substantial slowdowns. A 2024 scientific perspective paper authored by a group of scientists led by William J. Ripple proposed the start of the Anthropocene around 1850, stating it is a "compelling choice . . . from a population, fossil fuel, greenhouse gasses, temperature, and land use perspective."[51]
In May 2019 the twenty-nine members of the Anthropocene Working Group (AWG) proposed a start date for the Epoch in the mid-20th century, as that period saw "a rapidly rising human population accelerated the pace of industrial production, the use of agricultural chemicals and other human activities. At the same time, the first atomic-bomb blasts littered the globe with radioactive debris that became embedded in sediments and glacial ice, becoming part of the geologic record." The official start-dates, according to the panel, would coincide with either the radionuclides released into the atmosphere from bomb detonations in 1945, or with the Limited Nuclear Test Ban Treaty of 1963.[8]
The name Anthropocene is a combination of anthropo- from the Ancient Greekἄνθρωπος (ánthropos) meaning 'human' and -cene from καινός (kainós) meaning 'new' or 'recent'.[52][53]
As early as 1873, the Italian geologist Antonio Stoppani acknowledged the increasing power and effect of humanity on the Earth's systems and referred to an 'anthropozoic era'.[46]
The human impact on biodiversity forms one of the primary attributes of the Anthropocene.[54] Humankind has entered what is sometimes called the Earth's sixth major extinction.[55][56][57][58][59] Most experts agree that human activities have accelerated the rate of species extinction.[30][60] The exact rate remains controversial – perhaps 100 to 1000times the normal background rate of extinction.[61][62]
Anthropogenic extinctions started as humans migrated out of Africa over 60,000 years ago.[63] Increases in global rates of extinction have been elevated above background rates since at least 1500, and appear to have accelerated in the 19th century and further since.[1] Rapid economic growth is considered a primary driver of the contemporary displacement and eradication of other species.[64]
According to the 2021 Economics of Biodiversity review, written by Partha Dasgupta and published by the UK government, "biodiversity is declining faster than at any time in human history."[65][66] A 2022 scientific review published in Biological Reviews confirms that an anthropogenic sixth mass extinction event is currently underway.[67][68] A 2022 study published in Frontiers in Ecology and the Environment, which surveyed more than 3,000 experts, states that the extinction crisis could be worse than previously thought, and estimates that roughly 30% of species "have been globally threatened or driven extinct since the year 1500."[69][70] According to a 2023 study published in Biological Reviews some 48% of 70,000 monitored species are experiencing population declines from human activity, whereas only 3% have increasing populations.[71][72][73]
Summary of major environmental-change categories that cause biodiversity loss. The data is expressed as a percentage of human-driven change (in red) relative to baseline (blue), as of 2021. Red indicates the percentage of the category that is damaged, lost, or otherwise affected, whereas blue indicates the percentage that is intact, remaining, or otherwise unaffected.
Studies of urban evolution give an indication of how species may respond to stressors such as temperature change and toxicity. Species display varying abilities to respond to altered environments through both phenotypic plasticity and genetic evolution.[87][88][89] Researchers have documented the movement of many species into regions formerly too cold for them, often at rates faster than initially expected.[90]
Permanent changes in the distribution of organisms from human influence will become identifiable in the geologic record. This has occurred in part as a result of changing climate, but also in response to farming and fishing, and to the accidental introduction of non-native species to new areas through global travel.[1] The ecosystem of the entire Black Sea may have changed during the last 2000 years as a result of nutrient and silica input from eroding deforested lands along the Danube River.[91][92]
Researchers have found that the growth of the human population and expansion of human activity has resulted in many species of animals that are normally active during the day, such as elephants, tigers and boars, becoming nocturnal to avoid contact with humans, who are largely diurnal.[93][92]
One geological symptom resulting from human activity is increasing atmospheric carbon dioxide (CO2) content. This signal in the Earth's climate system is especially significant because it is occurring much faster,[94] and to a greater extent, than previously. Most of this increase is due to the combustion of fossil fuels such as coal, oil, and gas.
Changes in drainage patterns traceable to human activity will persist over geologic time in large parts of the continents where the geologic regime is erosional. This involves, for example, the paths of roads and highways defined by their grading and drainage control. Direct changes to the form of the Earth's surface by human activities (quarrying and landscaping, for example) also record human impacts.
It has been suggested[by whom?] that the deposition of calthemite formations exemplify a natural process which has not previously occurred prior to the human modification of the Earth's surface, and which therefore represents a unique process of the Anthropocene.[104] Calthemite is a secondary deposit, derived from concrete, lime, mortar or other calcareous material outside the cave environment.[105]Calthemites grow on or under man-made structures (including mines and tunnels) and mimic the shapes and forms of cave speleothems, such as stalactites, stalagmites, flowstone etc.
Stratigraphy
Sedimentological record
Human activities like deforestation and road construction are believed to have elevated average total sediment fluxes across the Earth's surface.[1] However, construction of dams on many rivers around the world means the rates of sediment deposition in any given place do not always appear to increase in the Anthropocene. For instance, many river deltas around the world are actually currently starved of sediment by such dams, and are subsiding and failing to keep up with sea level rise, rather than growing.[1][106]
Fossil record
Increases in erosion due to farming and other operations will be reflected by changes in sediment composition and increases in deposition rates elsewhere. In land areas with a depositional regime, engineered structures will tend to be buried and preserved, along with litter and debris. Litter and debris thrown from boats or carried by rivers and creeks will accumulate in the marine environment, particularly in coastal areas, but also in mid-ocean garbage patches. Such human-created artifacts preserved in stratigraphy are known as "technofossils".[1][107]
Twentieth-century technofossils in inundated landfill deposits at East Tilbury on the River Thames estuary.
Changes in biodiversity will also be reflected in the fossil record, as will species introductions. An example cited is the domestic chicken, originally the red junglefowlGallus gallus, native to south-east Asia but has since become the world's most common bird through human breeding and consumption, with over 60billion consumed annually and whose bones would become fossilised in landfill sites.[108] Hence, landfills are important resources to find "technofossils".[109]
Trace elements
In terms of trace elements, there are distinct signatures left by modern societies. For example, in the Upper Fremont Glacier in Wyoming, there is a layer of chlorine present in ice cores from 1960's atomic weapon testing programs, as well as a layer of mercury associated with coal plants in the 1980s.[110][111][112]
From the late 1940s, nuclear tests have led to local nuclear fallout and severe contamination of test sites both on land and in the surrounding marine environment. Some of the radionuclides that were released during the tests are 137Cs, 90Sr, 239Pu, 240Pu, 241Am, and 131I. These have been found to have had significant impact on the environment and on human beings. In particular, 137Cs and 90Sr have been found to have been released into the marine environment and led to bioaccumulation over a period through food chain cycles. The carbon isotope 14C, commonly released during nuclear tests, has also been found to be integrated into the atmospheric CO2, and infiltrating the biosphere, through ocean-atmosphere gas exchange. Increase in thyroid cancer rates around the world is also surmised to be correlated with increasing proportions of the 131I radionuclide.[113]
The highest global concentration of radionuclides was estimated to have been in 1965, one of the dates which has been proposed as a possible benchmark for the start of the formally defined Anthropocene.[114]
Human burning of fossil fuels has also left distinctly elevated concentrations of black carbon, inorganic ash, and spherical carbonaceous particles in recent sediments across the world. Concentrations of these components increases markedly and almost simultaneously around the world beginning around 1950.[1]
Anthropocene markers
A marker that accounts for a substantial global impact of humans on the total environment, comparable in scale to those associated with significant perturbations of the geological past, is needed in place of minor changes in atmosphere composition.[115][116]
A useful candidate for holding markers in the geologic time record is the pedosphere. Soils retain information about their climatic and geochemical history with features lasting for centuries or millennia.[117] Human activity is now firmly established as the sixth factor of soil formation.[118] Humanity affects pedogenesis directly by, for example, land levelling, trenching and embankment building, landscape-scale control of fire by early humans, organic matter enrichment from additions of manure or other waste, organic matter impoverishment due to continued cultivation and compaction from overgrazing. Human activity also affects pedogenesis indirectly by drift of eroded materials or pollutants. Anthropogenic soils are those markedly affected by human activities, such as repeated ploughing, the addition of fertilisers, contamination, sealing, or enrichment with artefacts (in the World Reference Base for Soil Resources they are classified as Anthrosols and Technosols). An example from archaeology would be dark earth phenomena when long-term human habitation enriches[119] the soil with black carbon.
Anthropogenic soils are recalcitrant repositories of artefacts and properties that testify to the dominance of the human impact, and hence appear to be reliable markers for the Anthropocene. Some anthropogenic soils may be viewed as the 'golden spikes' of geologists (Global Boundary Stratotype Section and Point), which are locations where there are strata successions with clear evidences of a worldwide event, including the appearance of distinctive fossils.[120] Drilling for fossil fuels has also created holes and tubes which are expected to be detectable for millions of years.[121] The astrobiologist David Grinspoon has proposed that the site of the Apollo11 Lunar landing, with the disturbances and artifacts that are so uniquely characteristic of our species' technological activity and which will survive over geological time spans could be considered as the 'golden spike' of the Anthropocene.[122]
An October 2020 study coordinated by University of Colorado at Boulder found that distinct physical, chemical and biological changes to Earth's rock layers began around the year 1950. The research revealed that since about 1950, humans have doubled the amount of fixed nitrogen on the planet through industrial production for agriculture, created a hole in the ozone layer through the industrial scale release of chlorofluorocarbons (CFCs), released enough greenhouse gasses from fossil fuels to cause planetary level climate change, created tens of thousands of synthetic mineral-like compounds that do not naturally occur on Earth, and caused almost one-fifth of river sediment worldwide to no longer reach the ocean due to dams, reservoirs and diversions. Humans have produced so many millions of tons of plastic each year since the early 1950s that microplastics are "forming a near-ubiquitous and unambiguous marker of Anthropocene".[123][124] The study highlights a strong correlation between global human population size and growth, global productivity and global energy use and that the "extraordinary outburst of consumption and productivity demonstrates how the Earth System has departed from its Holocene state since c. 1950 CE, forcing abrupt physical, chemical and biological changes to the Earth's stratigraphic record that can be used to justify the proposal for naming a new epoch—the Anthropocene."[124]
A December 2020 study published in Nature found that the total anthropogenic mass, or human-made materials, outweighs all the biomass on earth, and highlighted that "this quantification of the human enterprise gives a mass-based quantitative and symbolic characterization of the human-induced epoch of the Anthropocene."[125][126]
Debates
"While we often think of ecological damage as a modern problem our impacts date back millennia to the times in which humans lived as hunter-gatherers. Our history with wild animals has been a zero-sum game: either we hunted them to extinction, or we destroyed their habitats with agricultural land." - Hannah Ritchie for Our World in Data.
Although the validity of Anthropocene as a scientific term remains disputed, its underlying premise, i.e., that humans have become a geological force, or rather, the dominant force shaping the Earth's climate, has found traction among academics and the public. In an opinion piece for Philosophical Transactions of the Royal Society B, Rodolfo Dirzo, Gerardo Ceballos, and Paul R. Ehrlich write that the term is "increasingly penetrating the lexicon of not only the academic socio-sphere, but also society more generally", and is now included as an entry in the Oxford English Dictionary.[128] The University of Cambridge, as another example, offers a degree in Anthropocene Studies.[129] In the public sphere, the term Anthropocene has become increasingly ubiquitous in activist, pundit, and political discourses. Some who are critical of the term Anthropocene nevertheless concede that "For all its problems, [it] carries power."[130] The popularity and currency of the word has led scholars to label the term a "charismatic meta-category"[131] or "charismatic mega-concept."[132] The term, regardless, has been subject to a variety of criticisms from social scientists, philosophers, Indigenous scholars, and others.
The anthropologist John Hartigan has argued that due to its status as a charismatic meta-category, the term Anthropocene marginalizes competing, but less visible, concepts such as that of "multispecies."[133] The more salient charge is that the ready acceptance of Anthropocene is due to its conceptual proximity to the status quo – that is, to notions of human individuality and centrality.
Other scholars appreciate the way in which the term Anthropocene recognizes humanity as a geological force, but take issue with the indiscriminate way in which it does. Not all humans are equally responsible for the climate crisis. To that end, scholars such as the feminist theorist Donna Haraway and sociologist Jason Moore, have suggested naming the Epoch instead as the Capitalocene.[134][135][136] Such implies capitalism as the fundamental reason for the ecological crisis, rather than just humans in general.[137][138][139] However, according to philosopher Steven Best, humans have created "hierarchical and growth-addicted societies" and have demonstrated "ecocidal proclivities" long before the emergence of capitalism.[140] Hartigan, Bould, and Haraway all critique what Anthropocene does as a term; however, Hartigan and Bould differ from Haraway in that they criticize the utility or validity of a geological framing of the climate crisis, whereas Haraway embraces it.
In addition to "Capitalocene," other terms have also been proposed by scholars to trace the roots of the Epoch to causes other than the human species broadly. Janae Davis, for example, has suggested the "Plantationocene" as a more appropriate term to call attention to the role that plantation agriculture has played in the formation of the Epoch, alongside Kathryn Yusoff's argument that racism as a whole is foundational to the Epoch. The Plantationocene concept traces "the ways that plantation logics organize modern economies, environments, bodies, and social relations."[141][142][143][144] In a similar vein, Indigenous studies scholars such as Métis geographer Zoe Todd have argued that the Epoch must be dated back to the colonization of the Americas, as this "names the problem of colonialism as responsible for contemporary environmental crisis."[145] Potawatomi philosopher Kyle Powys Whyte has further argued that the Anthropocene has been apparent to Indigenous peoples in the Americas since the inception of colonialism because of "colonialism's role in environmental change."[146][147][148]
Other critiques of Anthropocene have focused on the genealogy of the concept. Todd also provides a phenomenological account, which draws on the work of the philosopher Sara Ahmed, writing: "When discourses and responses to the Anthropocene are being generated within institutions and disciplines which are embedded in broader systems that act as de facto 'white public space,' the academy and its power dynamics must be challenged."[149] Other aspects which constitute current understandings of the concept of the Anthropocene such as the ontological split between nature and society, the assumption of the centrality and individuality of the human, and the framing of environmental discourse in largely scientific terms have been criticized by scholars as concepts rooted in colonialism and which reinforce systems of postcolonial domination.[150] To that end, Todd makes the case that the concept of Anthropocene must be indigenized and decolonized if it is to become a vehicle of justice as opposed to white thought and domination.
The scholar Daniel Wildcat, a Yuchi member of the Muscogee Nation of Oklahoma, for example, has emphasized spiritual connection to the land as a crucial tenet for any ecological movement.[151] Similarly, in her study of the Ladakhi people in northern India, the anthropologist Karine Gagné, detailed their understanding of the relation between nonhuman and human agency as one that is deeply intimate and mutual. For the Ladakhi, the nonhuman alters the epistemic, ethical, and affective development of humans – it provides a way of "being in the world."[152] The Ladakhi, who live in the Himalayas, for example, have seen the retreat of the glaciers not just as a physical loss, but also as the loss of entities which generate knowledge, compel ethical reflections, and foster intimacy. Other scholars have similarly emphasized the need to return to notions of relatedness and interdependence with nature. The writer Jenny Odell has written about what Robin Wall Kimmerer calls "species loneliness,"[153] the loneliness which occurs from the separation of the human and the nonhuman, and the anthropologist Radhika Govindrajan has theorized on the ethics of care, or relatedness, which govern relations between humans and animals.[154] Scholars are divided on whether to do away with the term Anthropocene or co-opt it.
More recently, eco-philosopher David Abram, in a book chapter titled 'Interbreathing in the Humilocene', has proposed adoption of the term ‘Humilocene’ (the Epoch of Humility), which emphasizes an ethical imperative and ecocultural direction that human societies should take. The term plays with the etymological roots of the term ‘human’, thus connecting it back with terms such as humility, humus (the soil), and even a corrective sense of humiliation that some human societies should feel given their collective destructive impact on the earth.[155]
William Ruddiman has argued that the Anthropocene began approximately 8,000years ago with the development of farming and sedentary cultures.[156] At that point, humans were dispersed across all continents except Antarctica, and the Neolithic Revolution was ongoing. During this period, humans developed agriculture and animal husbandry to supplement or replace hunter-gatherer subsistence.[157] Such innovations were followed by a wave of extinctions, beginning with large mammals and terrestrial birds. This wave was driven by both the direct activity of humans (e.g. hunting) and the indirect consequences of land-use change for agriculture. Landscape-scale burning by prehistoric hunter-gathers may have been an additional early source of anthropogenic atmospheric carbon.[158] Ruddiman also claims that the greenhouse gas emissions in-part responsible for the Anthropocene began 8,000years ago when ancient farmers cleared forests to grow crops.[159][160][161]
Ruddiman's work has been challenged with data from an earlier interglaciation ("Stage11", approximately 400,000years ago) which suggests that 16,000more years must elapse before the current Holocene interglaciation comes to an end, and thus the early anthropogenic hypothesis is invalid.[162] Also, the argument that "something" is needed to explain the differences in the Holocene is challenged by more recent research showing that all interglacials are different.[163]
Homogenocene
Homogenocene (from old Greek: homo-, same; geno-, kind; kainos-, new;) is a more specific term used to define our current epoch, in which biodiversity is diminishing and biogeography and ecosystems around the globe seem more and more similar to one another mainly due to invasive species that have been introduced around the globe either on purpose (crops, livestock) or inadvertently. This is due to the newfound globalism that humans participate in, as species traveling across the world to another region was not as easily possible in any point of time in history as it is today.[164]
The term Homogenocene was first used by Michael Samways in his editorial article in the Journal of Insect Conservation from 1999 titled "Translocating fauna to foreign lands: Here comes the Homogenocene."[165]
The term was used again by John L. Curnutt in the year 2000 in Ecology, in a short list titled "A Guide to the Homogenocene",[166] which reviewed Alien species in North America and Hawaii: impacts on natural ecosystems by George Cox. Charles C. Mann, in his acclaimed book 1493: Uncovering the New World Columbus Created, gives a bird's-eye view of the mechanisms and ongoing implications of the homogenocene.[167]
The concept of the Anthropocene has also been approached via humanities such as philosophy, literature and art. In the scholarly world, it has been the subject of increasing attention through special journals,[168] conferences,[169][170] and disciplinary reports.[171] The Anthropocene, its attendant timescale, and ecological implications prompt questions about death and the end of civilisation,[172] memory and archives,[173] the scope and methods of humanistic inquiry,[174] and emotional responses to the "end of nature".[175] Some scholars have posited that the realities of the Anthropocene, including "human-induced biodiversity loss, exponential increases in per-capita resource consumption, and global climate change," have made the goal of environmental sustainability largely unattainable and obsolete.[176]
Historians have actively engaged the Anthropocene. In 2000, the same year that Paul Crutzen coined the term, world historian John McNeill published Something New Under the Sun,[177] tracing the rise of human societies' unprecedented impact on the planet in the twentieth century.[177] In 2001, historian of science Naomi Oreskes revealed the systematic efforts to undermine trust in climate change science and went on to detail the corporate interests delaying action on the environmental challenge.[178][179] Both McNeill and Oreskes became members of the Anthropocene Working Group because of their work correlating human activities and planetary transformation.
Popular culture
In 2019, the English musician Nick Mulvey released a music video on YouTube named "In the Anthropocene".[180] In cooperation with Sharp's Brewery, the song was recorded on 105 vinyl records made of washed-up plastic from the Cornish coast.[181]
The Anthropocene Reviewed is a podcast and book by author John Green, where he "reviews different facets of the human-centered planet on a five-star scale".[182]
Photographer Edward Burtynsky created "The Anthropocene Project" with Jennifer Baichwal and Nicholas de Pencier, which is a collection of photographs, exhibitions, a film, and a book. His photographs focus on landscape photography that captures the effects human beings have had on the earth.[183][184]
In 2020, Canadian musician Grimes released her fifth studio album titled Miss Anthropocene. The name is also a pun on the feminine title "Miss" and the words "misanthrope" and "Anthropocene."[186]
See also
Earth Overshoot Day– Calculated calendar date when humanity's yearly consumption exceeds Earth's replenishment
The Cenozoic is Earth's current geological era, representing the last 66million years of Earth's history. It is characterized by the dominance of mammals, birds, conifers, and angiosperms. It is the latest of three geological eras of the Phanerozoic Eon, preceded by the Mesozoic and Paleozoic. The Cenozoic started with the Cretaceous–Paleogene extinction event, when many species, including the non-avian dinosaurs, became extinct in an event attributed by most experts to the impact of a large asteroid or other celestial body, the Chicxulub impactor.
An extinction event is a widespread and rapid decrease in the biodiversity on Earth. Such an event is identified by a sharp fall in the diversity and abundance of multicellular organisms. It occurs when the rate of extinction increases with respect to the background extinction rate and the rate of speciation. Estimates of the number of major mass extinctions in the last 540 million years range from as few as five to more than twenty. These differences stem from disagreement as to what constitutes a "major" extinction event, and the data chosen to measure past diversity.
The Holocene is the current geological epoch, beginning approximately 11,700 years ago. It follows the Last Glacial Period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene is an interglacial period within the ongoing glacial cycles of the Quaternary, and is equivalent to Marine Isotope Stage 1.
The Holocene extinction, or Anthropocene extinction, is the ongoing extinction event caused by humans during the Holocene epoch. These extinctions span numerous families of plants and animals, including mammals, birds, reptiles, amphibians, fish, and invertebrates, and affecting not just terrestrial species but also large sectors of marine life. With widespread degradation of biodiversity hotspots, such as coral reefs and rainforests, as well as other areas, the vast majority of these extinctions are thought to be undocumented, as the species are undiscovered at the time of their extinction, which goes unrecorded. The current rate of extinction of species is estimated at 100 to 1,000 times higher than natural background extinction rates and is increasing. During the past 100–200 years, biodiversity loss and species extinction have accelerated, to the point that most conservation biologists now believe that human activity has either produced a period of mass extinction, or is on the cusp of doing so. As such, after the "Big Five" mass extinctions, the Holocene extinction event has also been referred to as the sixth mass extinction or sixth extinction; given the recent recognition of the Capitanian mass extinction, the term seventh mass extinction has also been proposed for the Holocene extinction event.
The Phanerozoic is the current and the latest of the four geologic eons in the Earth's geologic time scale, covering the time period from 538.8 million years ago to the present. It is the eon during which abundant animal and plant life has proliferated, diversified and colonized various niches on the Earth's surface, beginning with the Cambrian period when animals first developed hard shells that can be clearly preserved in the fossil record. The time before the Phanerozoic, collectively called the Precambrian, is now divided into the Hadean, Archaean and Proterozoic eons.
The Quaternary is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS), as well as the current and most recent of the twelve periods of the Phanerozoic eon. It follows the Neogene Period and spans from 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene and the Holocene ; a proposed third epoch, the Anthropocene, was rejected in 2024 by IUGS, the governing body of the ICS.
Climate variability includes all the variations in the climate that last longer than individual weather events, whereas the term climate change only refers to those variations that persist for a longer period of time, typically decades or more. Climate change may refer to any time in Earth's history, but the term is now commonly used to describe contemporary climate change, often popularly referred to as global warming. Since the Industrial Revolution, the climate has increasingly been affected by human activities.
Human ecology is an interdisciplinary and transdisciplinary study of the relationship between humans and their natural, social, and built environments. The philosophy and study of human ecology has a diffuse history with advancements in ecology, geography, sociology, psychology, anthropology, zoology, epidemiology, public health, and home economics, among others.
Habitat conservation is a management practice that seeks to conserve, protect and restore habitats and prevent species extinction, fragmentation or reduction in range. It is a priority of many groups that cannot be easily characterized in terms of any one ideology.
Paul Jozef Crutzen was a Dutch meteorologist and atmospheric chemist. He and Mario Molina and Frank Sherwood Rowland were awarded the Nobel Prize in Chemistry in 1995 for their work on atmospheric chemistry and specifically for his efforts in studying the formation and decomposition of atmospheric ozone. In addition to studying the ozone layer and climate change, he popularized the term Anthropocene to describe a proposed new epoch in the Quaternary period when human actions have a drastic effect on the Earth. He was also amongst the first few scientists to introduce the idea of a nuclear winter to describe the potential climatic effects stemming from large-scale atmospheric pollution including smoke from forest fires, industrial exhausts, and other sources like oil fires.
Human impact on the environment refers to changes to biophysical environments and to ecosystems, biodiversity, and natural resources caused directly or indirectly by humans. Modifying the environment to fit the needs of society is causing severe effects including global warming, environmental degradation, mass extinction and biodiversity loss, ecological crisis, and ecological collapse. Some human activities that cause damage to the environment on a global scale include population growth, neoliberal economic policies and rapid economic growth, overconsumption, overexploitation, pollution, and deforestation. Some of the problems, including global warming and biodiversity loss, have been proposed as representing catastrophic risks to the survival of the human species.
The Early Anthropocene Hypothesis is a stance concerning the beginning of the Anthropocene first proposed by William Ruddiman in 2003. It posits that the Anthropocene, a proposed geological epoch coinciding with the most recent period in Earth's history when the activities of the human race first began to have a significant global impact on Earth's climate and ecosystems, dates back to 8,000 years ago, triggered by intense farming activities after agriculture became widespread. It was at that time that atmospheric greenhouse gas concentrations stopped following the periodic pattern of rises and falls that had accurately characterized their past long-term behavior, a pattern that is explained by natural variations in Earth's orbit known as Milankovitch cycles. Ruddiman's proposed start-date has been met with criticism from scholars in a variety of fields.
Quaternary science is the subfield of geology which studies the Quaternary Period commonly known as the ice age. The Quaternary Period is a time period that started around 2.58 million years ago and continues today. This period is divided into two epochs – the Pleistocene Epoch and the Holocene Epoch. The aim of Quaternary science is to understand everything that happened during the Pleistocene Epoch and the Holocene Epoch to be able to acquire fundamental knowledge about Earth's environment, ecosystem, climate changes, etc. Quaternary science was first studied during the nineteenth century by Georges Cuvier, a French scientist. Most Quaternary scientists have studied the history of the Quaternary to predict future changes in climate.
Environmental issues are disruptions in the usual function of ecosystems. Further, these issues can be caused by humans or they can be natural. These issues are considered serious when the ecosystem cannot recover in the present situation, and catastrophic if the ecosystem is projected to certainly collapse.
Planetary boundaries are a framework to describe limits to the impacts of human activities on the Earth system. Beyond these limits, the environment may not be able to self-regulate anymore. This would mean the Earth system would leave the period of stability of the Holocene, in which human society developed. The framework is based on scientific evidence that human actions, especially those of industrialized societies since the Industrial Revolution, have become the main driver of global environmental change. According to the framework, "transgressing one or more planetary boundaries may be deleterious or even catastrophic due to the risk of crossing thresholds that will trigger non-linear, abrupt environmental change within continental-scale to planetary-scale systems."
Novel ecosystems are human-built, modified, or engineered niches of the Anthropocene. They exist in places that have been altered in structure and function by human agency. Novel ecosystems are part of the human environment and niche, they lack natural analogs, and they have extended an influence that has converted more than three-quarters of wild Earth. These anthropogenic biomes include technoecosystems that are fuelled by powerful energy sources including ecosystems populated with technodiversity, such as roads and unique combinations of soils called technosols. Vegetation associations on old buildings or along field boundary stone walls in old agricultural landscapes are examples of sites where research into novel ecosystem ecology is developing.
William Lee Steffen was an American-born Australian chemist. He was the executive director of the Australian National University (ANU) Climate Change Institute and a member of the Australian Climate Commission until its dissolution in September 2013. From 1998 to 2004, he was the executive director of the International Geosphere-Biosphere Programme, a coordinating body of national environmental change organisations based in Stockholm. Steffen was one of the founding climate councillors of the Climate Council, with whom he frequently co-authored reports, and spoke in the media on issues relating to climate change and renewable energy.
Biodiversity loss happens when plant or animal species disappear completely from Earth (extinction) or when there is a decrease or disappearance of species in a specific area. Biodiversity loss means that there is a reduction in biological diversity in a given area. The decrease can be temporary or permanent. It is temporary if the damage that led to the loss is reversible in time, for example through ecological restoration. If this is not possible, then the decrease is permanent. The cause of most of the biodiversity loss is, generally speaking, human activities that push the planetary boundaries too far. These activities include habitat destruction and land use intensification. Further problem areas are air and water pollution, over-exploitation, invasive species and climate change.
Conservation paleobiology is a field of paleontology that applies the knowledge of the geological and paleoecological record to the conservation and restoration of biodiversity and ecosystem services. Despite the influence of paleontology on ecological sciences can be traced back at least at the 18th century, the current field has been established by the work of K.W. Flessa and G.P. Dietl in the first decade of the 21st century. The discipline utilizes paleontological and geological data to understand how biotas respond to climate and other natural and anthropogenic environmental change. These information are then used to address the challenges faced by modern conservation biology, like understanding the extinction risk of endangered species, providing baselines for restoration and modelling future scenarios for species range's contraction or expansion.
The Anthropocene Working Group (AWG) is an interdisciplinary research group dedicated to the study of the Anthropocene as a geological time unit. It was established in 2009 as part of the Subcommission on Quaternary Stratigraphy (SQS), a constituent body of the International Commission on Stratigraphy (ICS). As of 2021, the research group features 37 members, with the physical geographer Simon Turner as Secretary and the geologist Colin Neil Waters as chair of the group. The late Nobel Prize-winning Paul Crutzen, who popularized the word 'Anthropocene' in 2000, had also been a member of the group until he died on January 28, 2021. The main goal of the AWG is providing scientific evidence robust enough for the Anthropocene to be formally ratified by the International Union of Geological Sciences (IUGS) as an epoch within the Geologic time scale.
↑ Waters, Colin N.; Zalasiewicz, Jan; Summerhayes, Colin; Barnosky, Anthony D.; Poirier, Clément; Gałuszka, Agnieszka; Cearreta, Alejandro; Edgeworth, Matt; Ellis, Erle C. (8 January 2016). "The Anthropocene is functionally and stratigraphically distinct from the Holocene". Science. 351 (6269): aad2622. doi:10.1126/science.aad2622. ISSN0036-8075. PMID26744408. S2CID206642594.
↑ Lovelock, James; Appleyard, Bryan (4 July 2019). Novacene: the coming age of hyperintelligence. London: Allen Lane. ISBN9780241399361. OCLC1104037419.
↑ Ripple, William J.; Wolf, Christopher; van Vuuren, Detlef P.; Gregg, Jillian W.; Lenzen, Manfred (9 January 2024). "An environmental and socially just climate mitigation pathway for a planet in peril". Environmental Research Letters. 19 (2): 021001. Bibcode:2024ERL....19b1001R. doi:10.1088/1748-9326/ad059e. Specifically, our results show a great escalation beginning around 1850 for most variables. If combined with information on carrying capacity or planetary boundaries, these data could be used to explore the possibility that human demands on multiple fronts have greatly accelerated and may have approached or exceeded the biosphere's regenerative capacity. From a population, fossil fuel, greenhouse gasses, temperature, and land use perspective, the mid 19th century (∼1850) stands out as a compelling choice among the potential starting points for the Anthropocene.
↑ Finn, Catherine; Grattarola, Florencia; Pincheira-Donoso, Daniel (2023). "More losers than winners: investigating Anthropocene defaunation through the diversity of population trends". Biological Reviews. 98 (5): 1732–1748. doi:10.1111/brv.12974. PMID37189305. S2CID258717720.
1 2 Bradshaw, Corey J. A.; Ehrlich, Paul R.; Beattie, Andrew; Ceballos, Gerardo; Crist, Eileen; Diamond, Joan; Dirzo, Rodolfo; Ehrlich, Anne H.; Harte, John; Harte, Mary Ellen; Pyke, Graham; Raven, Peter H.; Ripple, William J.; Saltré, Frédérik; Turnbull, Christine; Wackernagel, Mathis; Blumstein, Daniel T. (2021). "Underestimating the Challenges of Avoiding a Ghastly Future". Frontiers in Conservation Science. 1. doi:10.3389/fcosc.2020.615419.
↑ Stokstad, Erik (6 May 2019). "Landmark analysis documents the alarming global decline of nature". Science. doi:10.1126/science.aax9287. For the first time at a global scale, the report has ranked the causes of damage. Topping the list, changes in land use—principally agriculture—that have destroyed habitat. Second, hunting and other kinds of exploitation. These are followed by climate change, pollution, and invasive species, which are being spread by trade and other activities. Climate change will likely overtake the other threats in the next decades, the authors note. Driving these threats are the growing human population, which has doubled since 1970 to 7.6 billion, and consumption. (Per capita of use of materials is up 15% over the past 5 decades.)
↑ Pimm SL, Jenkins CN, Abell R, Brooks TM, Gittleman JL, Joppa LN, Raven PH, Roberts CM, Sexton JO (May 2014). "The biodiversity of species and their rates of extinction, distribution, and protection". Science. 344 (6187): 1246752. doi:10.1126/science.1246752. PMID24876501. S2CID206552746. The overarching driver of species extinction is human population growth and increasing per capita consumption.
↑ Cafaro, Philip; Hansson, Pernilla; Götmark, Frank (August 2022). "Overpopulation is a major cause of biodiversity loss and smaller human populations are necessary to preserve what is left"(PDF). Biological Conservation. 272. 109646. Bibcode:2022BCons.27209646C. doi:10.1016/j.biocon.2022.109646. ISSN0006-3207. S2CID250185617. Archived(PDF) from the original on 8 December 2023. Retrieved 25 December 2022. Conservation biologists standardly list five main direct drivers of biodiversity loss: habitat loss, overexploitation of species, pollution, invasive species, and climate change. The Global Assessment Report on Biodiversity and Ecosystem Services found that in recent decades habitat loss was the leading cause of terrestrial biodiversity loss, while overexploitation (overfishing) was the most important cause of marine losses (IPBES, 2019). All five direct drivers are important, on land and at sea, and all are made worse by larger and denser human populations.
↑ Crist, Eileen; Mora, Camilo; Engelman, Robert (21 April 2017). "The interaction of human population, food production, and biodiversity protection". Science. 356 (6335): 260–264. Bibcode:2017Sci...356..260C. doi:10.1126/science.aal2011. PMID28428391. S2CID12770178. Retrieved 2 January 2023. Research suggests that the scale of human population and the current pace of its growth contribute substantially to the loss of biological diversity. Although technological change and unequal consumption inextricably mingle with demographic impacts on the environment, the needs of all human beings—especially for food—imply that projected population growth will undermine protection of the natural world.
↑ Hughes, Alice C.; Tougeron, Kévin; Martin, Dominic A.; Menga, Filippo; Rosado, Bruno H. P.; Villasante, Sebastian; Madgulkar, Shweta; Gonçalves, Fernando; Geneletti, Davide; Diele-Viegas, Luisa Maria; Berger, Sebastian; Colla, Sheila R.; de Andrade Kamimura, Vitor; Caggiano, Holly; Melo, Felipe (1 January 2023). "Smaller human populations are neither a necessary nor sufficient condition for biodiversity conservation". Biological Conservation. 277: 109841. Bibcode:2023BCons.27709841H. doi:10.1016/j.biocon.2022.109841. ISSN0006-3207. Through examining the drivers of biodiversity loss in highly biodiverse countries, we show that it is not population driving the loss of habitats, but rather the growth of commodities for export, particularly soybean and oil-palm, primarily for livestock feed or biofuel consumption in higher income economies.
↑ "Deep ice tells long climate story". BBC News. 4 September 2006. Retrieved 28 November 2015. The 'scary thing', [Dr.Wolff] added, was the rate of change now occurring in CO2 concentrations. In the core, the fastest increase seen was of the order of 30parts per million (ppm) by volume over a period of roughly 1,000years. The last 30ppm of increase has occurred in just 17years. We really are in the situation where we don't have an analogue in our records.
↑ Etheridge, D.M.; L.P. Steele; R.L. Langenfelds; R.J. Francey; J.-M. Barnola; V.I. Morgan (1996). "Natural and anthropogenic changes in atmospheric CO2 over the last 1000 years from air in Antarctic ice and firn". Journal of Geophysical Research. 101 (D2): 4115–28. Bibcode:1996JGR...101.4115E. doi:10.1029/95JD03410. ISSN0148-0227. S2CID19674607.
↑ Lindsey, Rebecca; Dahlman, Luann (28 June 2022). "Climate Change: Global Temperature". climate.gov. National Oceanic and Atmospheric Administration. Archived from the original on 17 September 2022.
↑ Intergovernmental Panel on Climate Change (IPCC), ed. (2022), "Summary for Policymakers", The Ocean and Cryosphere in a Changing Climate: Special Report of the Intergovernmental Panel on Climate Change, Cambridge: Cambridge University Press, pp.3–36, doi:10.1017/9781009157964.001, ISBN978-1-009-15796-4, retrieved 24 April 2023
↑ Sousa, Matthew; Benson, Bryce; Welty, Connor; Price, Dylan; Thirkill, Ruth; Erickson, William; etal. (February 2020). "Atmospheric Deposition of Coal-Related Pollutants in the Pacific Northwest of the United States from 1950 to 2016". Environmental Toxicology and Chemistry. 39 (2): 335–342. doi:10.1002/etc.4635. PMID31743941. S2CID208186469.
↑ Zalasiewicz, J.; Williams, M.; Steffen, W. & Crutzen, P.J. (2010). "Response to 'The Anthropocene forces us to reconsider adaptationist models of human-environment interactions'". Environmental Science & Technology. 44 (16): 6008. Bibcode:2010EnST...44.6008Z. doi:10.1021/es102062w.
↑ Hickel, Jason (2021). Less is More: How Degrowth Will Save the World. Windmill Books. pp.39–40. ISBN978-1786091215. It was only with the rise of capitalism over the past few hundred years, and the breathtaking acceleration of industrialization from the 1950s, that on a planetary scale things began to tip out of balance.
↑ Best, Steven (2021). "Failed Species: The Rise and Fall of the Human Empire". Romanian Journal of Artistic Creativity. 9 (2). Today we call this planetary monolith "global capitalism," but humans became global animals tens of thousands of years before the onset of capitalism. Humans created hierarchical and growth-addicted societies some ten thousand years ago and their ecocidal proclivities stretch back millennia more into prehistory. And just like every political empire of the past, the human empire has possibly reached its zenith and begun its downward spiral toward collapse. This empire's peak and slide into catastrophe marks a new epoch not only in human history, but also the history of the earth. Debates over whether advanced societies have entered into a new "postmodernity" pale in significance to the scientifically-based proposition that human activity has created a new epoch in geological history—the age of the Anthropocene. This epoch characterized by the dominance of human influence over earth's systems and has led to, among other colossal events, a sixth mass extinction crisis and runaway climate change.
↑ Whyte, Kyle (2016). "Is it Colonial DéJà Vu? Indigenous Peoples and Climate Injustice". In Adamson, Joni (ed.). Humanities for the Environment: Integrating Knowledges, Forging New Constellations of Practice. Routledge. pp.88–104. doi:10.2139/ssrn.2925277. SSRN2925277.
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↑ Michael, Samways (1999). "Translocating fauna to foreign lands: Here comes the Homogenocene". Journal of Insect Conservation. 3 (2): 65–66. doi:10.1023/A:1017267807870. S2CID263987331.
↑ Rachel Carson; Alexander von Humboldt (14 June 2013). Culture and the Anthropocene. Munich, Germany. Retrieved 21 July 2014.
↑ Wenzel, Jennifer (13 March 2014). "Climate Change". State of the Discipline Report: Ideas of the Decade. American Comparative Literature Association.
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↑ Oreskes, Naomi; Eric, Conway (2010). Merchants of Doubt: How a handful of scientists obscured the truth on issues from tobacco smoke to climate change.
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